Where does the term Mickey come from?
Just so, what drug is called a Mickey?
In slang, a Mickey Finn (or simply a Mickey) is a drink laced with a psychoactive drug or incapacitating agent (especially chloral hydrate) given to someone without their knowledge, with intent to incapacitate them. Serving someone a "Mickey" is most commonly referred to as "slipping someone a mickey".
Also question is, how do you slip a mickey?
To slip someone a Mickey (Finn) is to surreptitiously drug someone's alcoholic drink or to give someone a drink that had been drugged without their knowledge or consent with the intent of incapacitating them. Ayto, John.
Excerpt from Annie (1982) "It's a Hard Knock Life" Mickey Finn n. Slang. An alcoholic beverage that is surreptitiously altered to induce diarrhea or stupefy, render unconscious or otherwise incapacitate the person who drinks it.